Welcome to BHS Computer Science. If you are a student in the class, the first thing you need to do (and which we should have done in class) is set up your GitHub account.
Once you have a GitHub account, click “Log in to GitHub” below to proceed. Or you can click “Use anonymously” to play with the environment but you will not be able to save your work or submit assignments. (You can always log in later by clicking the at the top of the page.)
If you don’t have a GitHub account yet, please create one and then log in here for further instructions.
Congratulations! You have successfully connected this app to GitHub. However you are not yet a member of the GitHub organization for this class, something Mr. Seibel needs to set up for you.
This is your GitHub profile URL:
Click the clipboard icon to copy it and then submit it at this form so he can add you.
Congratulations! You have successfully connected this app to GitHub. And it looks like you have an invitation to join the GitHub organization for this class. You need to accept that invitation before you can proceed. The invite should be sent to whatever email you used when you created your GitHub account.
I see you are logged into GitHub and a member of the berkeley-high-cs GitHub organization. However there seems to have been some problem finishing the setup for your account. Please let Mr. Seibel know.
This is a tool for the BHS Computer Science class at Berkeley High School. It is intended to provide a simple environment for experimenting with Javascript without all the complexities of a full development environment such as ReplIt or Glitch which we may use later in the year.
It is also designed to take advantage of the browser’s ability to run Javascript natively. It does not need access to a server to run code making in extremely responsive even if the Wifi is flaking out.
Finally, under the covers it is saving work to a GitHub repository in a very simplified workflow that does not depend on immediately learning any git commands. Code written in this environment for each assignment is saved to a directory and branch specific to that assignment each time it is saved. Thus when the assignment is done, it is easy to go to GitHub and create a PR containing just the work on that assignment which can then be commented on and worked on further before it is turned in and merged to main.
You're all set! You don't need to worry about this yet but we have successfully created a GitHub repository for your work:
You can get to it any time by clicking on your GitHub username at the top-right of the screen.
This assessment consists of functions you need to write involving numeric, boolean, and string expressions as well as some use of control constructs. It is a closed book assessment. You should stay on this tab until you are done and there should be no talking. This assessment is about how much you understand. There are no automatic tests but you can use the REPL to test things yourself.
You can move through the questions with the arrows at the upper right
next to the 1 of indicator so if
you're not sure how to write one function move on to another one and
come back if you have time at the end. I want to see how much you do
know. Note: you can also click on
thingsLikeThis in these instructions and the questions to
copy them to the clipboard to avoid spelling mistakes.
Some functions that you may find useful are Math.abs,
Math.floor, and Math.sqrt which all take a
single numeric argument and return, respectively, the absolute value
of the argument, the nearest integer less than the argument, and the
square root of the argument. Also useful is
Math.min which takes any number of arguments and returns
the minimum value, e.g. Math.min(33, 44) returns
33.
When you are done, please submit a GitHub pull request of the
branch and request me as a reviewer.
Doing this correctly is part of the assessment.
Write a function named averageWeight that takes two
arguments, the total weight of a number of items and the number
of items, and returns the average weight of an item. E.g. if the
total weight is 1,000 and there are 20 items, the average weight
is 50.
Write a function named hypotenuse that takes two
arguments representing the lengths of the two legs of a right
triangle and returns the length of the hypotenuse. Recall the
Pythagorean theorem that tells us that c2 = a2
+ b2 where a and b are the lengths of
the two legs of a right triangle and c is the length of
the hypotenuse.
Write a function named maxRadius that takes two
arguments, the first being the width and the second being the
height of a drawing area. It should return the radius of the
largest circle that can be drawn in the drawing area.
Write a function named numCircles that takes two
arguments, the radius of a circle and the width of a drawing
area, and returns the largest integer number of non-overlapping
circles of the given radius that can be drawn in a line across
the drawing area..
Write a function named offset that takes two
arguments, the width, in pixels, of a drawing area and the width
of a figure (guaranteed to be less than the total width, also in
pixels) and which returns the number of pixels from the left
side of the drawing to shift the figure to be horizontally
centered in the drawing area.
Write a function named canSleepIn that takes two
boolean arguments, the first saying whether it's a weekday and
the second saying whether you're on vacation, and returns
true if you are allowed to sleep in and
false otherwise. The rules are you can always sleep
in when you're on vacation and you can also sleep in on
weekends.
Write a function named canGoToProm which takes
three boolean arguments describing a person. The first specifies
if they are a senior, the second specifies if they were invited
to prom by a senior, and the third specifies if they are on the
prom exclusion list. The function should return a boolean
indicating whether or not the person is eligible to go to prom.
The rules are seniors and people invited by seniors are eligible
unless they are on the exclusion list.
Write a function named getsSpeedingTicket that
takes two arguments, a number indicating the speed in miles per
hour that you were driving and a boolean indicating whether the
cop who pulled you over is grouchy. Return a boolean value
indicating whether you will get a ticket given that a grouchy
cop will give you a ticket if you are going over 65 while a
non-grouchy cop will only give you a ticket if you're going over
70 mph.
Write a function named moreThanTwiceAsLong that
takes two string arguments and returns a boolean indicating
whether the first string contains more than twice as many
characters as the second string.
Write a function named aFartherThanB that takes
three arguments, all numbers and returns a boolean indicating
whether the first argument is farther away (on the number line)
from the third argument than the second argument. I.e. if we
call the arguments a, b, and c, return true if a is
farther away from c than b is.
Write a function named firstHalf that takes a
single string argument and returns the first half of the string.
(If the string has an odd number of characters it doesn't matter
whether or not you include the extra character.) For instance
the first half of 'foobar' is
'foo' but if the argument was
'fooquux' then either 'foo' or
'fooq' would be acceptable return values.
Write a function named secondHalf that takes a
single string argument and returns the second half of the
string. (If the string has an odd number of characters it
doesn't matter whether or not you include the extra character.)
For instance the second half of 'foobar' is
'bar' but if the argument was
'fooquux' then either 'quux' or
'uux' would be acceptable return values. For
maximum style points write this function and
firstHalf so that
firstHalf(s) + secondHalf(s) gives you back
s.
Write a function named upDown that takes a single
string argument and returns a string consisting of the original
string all in upper case concatenated (“smooshed together”) with
the string all in lower case. E.g. called with
'foo' it should return 'FOOfoo'.
Write a function named everyOther that takes a
single string argument that is at least five characters long and
returns a string consisting of just the first, third, and fifth
characters of the argument string. E.g. called with
'foobar' it should return 'foa'.
Write a function named upDownLastCharacter that
takes a single string argument that is at least one character
long and returns a string consisting of two characters, the
uppercase version of the last character of the argument string
and the lowercase version of that same character. E.g. called
with 'foo' it should return 'Oo'.
Write a function named yesIfEven that takes a
single argument which will be a number and returns the string
'yes' if the argument is even and
'no' otherwise.
Write a function named countXs that takes a single
string argument and returns the number of 'x'
characters that occur in the string.
Write a function named timesTable that takes a
single number as its argument and emits a times table of all the
products from 1 × 1 to n × n. Use the emit function
defined in the starter code to actually emit the different
values. It takes three arguments, the two numbers being
multiplied and their product, and prints them out nicely; you
just need to call it once for each pair of arguments. N.B. that
order matters so, assuming you are emitting a times table that
includes 2 × 3 you need to call both
emit(2, 3, 6) and emit(3, 2, 6).
Write a function named containsX that takes a
single string argument and returns a boolean that indicates
whether the string contains any 'x' characters.
Write a function named sumSquares that takes a
single number argument and returns the sum of the squares of all
the positive integers less than the argument. For instance given
the argument 4 it should return 14,
i.e. 12 + 22 + 32, i.e. 1 + 4 +
9.